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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019) - St. Petersburg, Russia (18–20 September 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019) - Resonant laser-assisted process of the ultrarelativistic electron-positron pair creation by a gamma quantum in the nucleus field
摘要： The resonant laser-assisted process of creation of the ultrarelativistic electron-positron pair by a gamma quantum in the nucleus field was studied theoretically. Unlike the processes in absence of laser field, the laser-assisted processes can occur both non-resonant and resonant way. This is explained by the fact that in the field of laser the processes of first order in the fine structure constant are able to take a place. Due to that the process of second order effectively reduces to two successive processes of the first order. The resonant kinematics was studied in details. It was shown that the process has characteristic threshold energy. Resonant differential cross section of studied process was obtained. It’s magnitude significantly exceed the corresponding resonant differential cross section without a laser field. The project calculation can be experimentally verified by the scientific laser plasma facilities of pulsed radiation (SLAC, FAIR, XFEL, ELI, XCELS).
关键词： threshold energy,ultrarelativistic electron-positron pair,gamma quantum,differential cross section,resonant laser-assisted process,nucleus field
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [AIP Publishing PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019) - St. Petersburg, Russia (18–20 September 2019)] PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES AND APPLICATIONS IN PLASMA PHYSICS (AAPP 2019) - Resonant laser-assisted process of the electron-positron pairs annihilation and production
摘要： A resonant laser-assisted process of the electron-positron pairs annihilation and production is studied theoretically. The second order in fine structure constant process in the laser field transforms into two consistent processes of first order in the fine structure constant: laser-assisted annihilation of initial electron-positron pair into intermediate photon and laser-assisted production of final electron-positron pair by intermediate photon under resonant conditions when virtual photon becomes real. It is demonstrated that the resonant conditions for initial pair include the excess of certain combination of the electron and positron energies over threshold energy and narrow angle between momenta of electron and positron. The same holds true for the final pair. Also, final positron emission angle can vary from zero to some maximum value. It is shown that energies of the final particles depend on this angle and can take from one to two values. A resonant differential cross section of the studied process is obtained. It is shown that the resonant differential cross section can significantly exceed the corresponding cross section without an external field (Bhabha cross section). The project calculations may be experimentally verified by the scientific facilities of pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS).
关键词： electron-positron pairs,annihilation,laser field,production,quantum electrodynamics,resonant laser-assisted process,resonant differential cross section
更新于2025-09-11 14:15:04